Wheat stems


The scientific name is Apophylia thalassina (Faldermann), Coleoptera. Alias ​​wheat stem leaf A, wheat golden flower insects. The distribution starts from Heilongjiang and Inner Mongolia in the north, and has not passed the Huaihe River in the south, but spreads in the west and spreads in Qinghai. Shanxi, Gansu, and Hebei are increasingly serious.

Host corn, corn, alfalfa, acacia, willow and so on.

The larvae are damaged by the characteristics of the larvae from 1.5cm below the soil into the stems of the wheat stems, resulting in dead dead seedlings and white spikes, invalid mulberry, resulting in a lack of seedlings and ridges in large wheat fields. It is a devastating pest of wheat.

Morphological characteristics Female adult body length 7-9mm, coleopteran bronze, sporangial abdominal extension beyond the sheath wing cover; male adult body length 6-7mm, head front brown, rear dark brown, tentacles, 11 whip The thoracodorsal plate is yellow-brown, with 3 black markings on the middle and larger in the middle. The eel green has fluorescence and dense yellow hair. Egg length 0.8 to 1.5mm, oval, early light yellow, blue gray when wintering. The last instar larvae are 9-12 mm in length, yellowish-brown, with a dark brown and brown plate on the chest shield and the hip plate. Dark black spots of various sizes on the back of the body are arranged neatly. Bare beak 6-9mm long, beige, cylindrical, with 2 thorns at the end.

Habits of life in North China, an annual generation, the eggs on the ground surface of a m overwintering, in late March the following year, the jointing of wheat, the egg began to hatch, early in April the beginning of the golden jointing of eggs into the hatching period. From the jointing to the booting stage of wheat, the larvae of the stem and leaf larvae of wheat were damaged. The larvae in the early stage of booting of wheat started to grow into pods. The larvae have the habit of transforming plants. Each larvae can damage 7-16.9 strains. Adults often cluster on small cockles in the morning and evening, eating large numbers of holes in the leaves, or even a small part of the main vein. Eggs are scattered in earth seams and loose soil. The occurrence of this worm is closely related to topography, cultivation, and meteorological conditions. Generally, shallow hilly areas, continuous cropping fields, and extensive farming plots are prone to occur. Heavy rain occurs during the hatching season of eggs.

Prevention and control methods (1) Removal of barnyardgrass in wheat fields in mid-late and late May can reduce adult oviposition opportunities. (2) In the period of adult emergence, spray 90% crystal trichlorfon 1000 times or 50% dichlorvos EC 1000 times, 50% 1605 EC 1500 times, 10% Bromofluth emulsifiable concentrate 1500 times, 2.5% Emulsion 2000 times, 2.5% deltamethrin EC 2000 times, and 50% malathion EC 1000 times. (3) cure eggs. Deep plowing 25-30cm in autumn can destroy eggs. (4) Treat larvae. With 1.5% methyl 1605 powder or 2.5% trichlorfon powder or 2% killer pine powder, about 667m22kg or so, combined with cultivator watering, with medicine into the soil, can prevent the damage of larvae. Can also be used 40% Dimethoate EC 2000 times or 50% 1605 Emulsion or 90% crystal dipterex 1000-2000 times Irrigation.


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